I never really knew what the skin disease in dogs called Mange was or what caused it so I decided to do a little research. To my surprise pinkmeupnails.com there are two types of Mange in dogs which are caused by mites, sarcoptic mange and demodectic mange. Sarcoptic mange is caused by Sarcoptic mites that tunnel in the skin and causes intense itching, thickened skin, and loss of hair. It is usually found on the dogs ears, face, legs and elbows. Sarcoptic mange is contagious and can also be passed to huma.